Debenture holder as a member?

Harshit Sardana (44 Points)

21 May 2020  
Member is Beneficial owner(#2(55))
And beneficial owner is dmat a/c holder acc to depository system.
So if we trade in debentures through our dmat, nsdl/cdsl maintain my record as registered owner. As per this, we will be beneficial owner of the co. and also the members. Where law tells us that debenture holders are not the members of the company?